Fabrication of Monolithic Bridge Structures by Vacuum-Assisted Capillary-Force Lithography

Rhokyun Kwak, Hoon Eui Jeong, Kahp Y. Suh

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


Monolithic bridge structures were fabricated by using capillary-force lithography (CFL), which was developed for patterning polymers over a large area by combining essential features of nanoimprint lithography and capillarity. A patterned soft mold was placed on a spin-coated UV-curable resin on a substrate. The polymer then moved into the cavity of the mold by capillary action and then solidified after exposure to UV radiation. The uncured resin was forced to migrate into the cavity of a micropatterned PDMS mold by capillarity, and then exposed to UV radiation under a high-energy mercury lamp with intensity. A rotary pump was then turned on, decreasing the air pressure in the chamber. SEM images were taken with a high-resolution SEM at an acceleration voltage greater than 15 kV. It was observed that when the air pressure was rapidly reduced to a low vacuum, the top layer moved into the nanochannels with a meniscus at the interface between the nanoscale PUA and the base structure.
Original languageEnglish (US)
Pages (from-to)790-794
Number of pages5
Issue number7
StatePublished - Apr 6 2009
Externally publishedYes


Dive into the research topics of 'Fabrication of Monolithic Bridge Structures by Vacuum-Assisted Capillary-Force Lithography'. Together they form a unique fingerprint.

Cite this